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Using debug/elf is better on all fronts: faster, simpler, no external deps.
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In preparation to support big-endian architectures.
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Overall idea of netlink checking.
Currnetly we check netlink policies for common detectable mistakes.
First, we detect what looks like a netlink policy in our descriptions
(these are structs/unions only with nlattr/nlnext/nlnetw fields).
Then we find corresponding symbols (offset/size) in vmlinux using nm.
Then we read elf headers and locate where these symbols are in the rodata section.
Then read in the symbol data, which is an array of nla_policy structs.
These structs allow to easily figure out type/size of attributes.
Finally we compare our descriptions with the kernel policy description.
Update #590
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On OpenBSD, nm(1) does not support the `-S' option.
The order of symbols from nm(1) varies between platforms, therefore rework the
test case to cope with that.
Fixes #723
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Fix typos, non-canonical code, remove dead code, etc.
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When manager is stopped there are sometimes runaway qemu
processes still running. Set PDEATHSIG for all subprocesses.
We never need child processes outliving parents.
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